The arylation of bicyclic oxathiane glycosyl donors has been achieved usingbenzyne generated in situ from 1-aminobenzotriazole (1-ABT) and lead tetraacetate. Following sulfur arylation, glycosylation of acetate ions proceeded with high levels of stereoselectivity to afford alpha -glycosyl acetates in a 'one-pot' reaction, even in the presence of alternative acceptor alcohols.